221131321100 has 18 divisors (see below), whose sum is σ = 479854967004. Its totient is φ = 88452528400.

The previous prime is 221131321091. The next prime is 221131321123. The reversal of 221131321100 is 1123131122.

It is a super-2 number, since 2×221131321100² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1105656506 + ... + 1105656705.

It is an arithmetic number, because the mean of its divisors is an integer number (26658609278).

Almost surely, 2^221131321100 is an apocalyptic number.

221131321100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221131321100 is an abundant number, since it is smaller than the sum of its proper divisors (258723645904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221131321100 is a wasteful number, since it uses less digits than its factorization.

221131321100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2211313225 (or 2211313218 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 221131321100 its reverse (1123131122), we get a palindrome (222254452222).

The spelling of 221131321100 in words is "two hundred twenty-one billion, one hundred thirty-one million, three hundred twenty-one thousand, one hundred".